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在VB中改变显示器的分辨率

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在VB中改变显示器的分辨率
重庆邮电学院
徐原
---- 有一些游戏如《Delta Force》可以让玩家在玩游戏时改变显示器的分辨率,现在介绍一种在VB中实现的方法。

---- 这里要用到一个在VB的API浏览器中没有的函数,声明如下:

---- Private Declare Function ChangeDisplaySettings Lib "user32" Alias_ "ChangeDisplaySettingsA" (ByVal lpDevMode As Long, ByVal dwflags As Long) As Long

---- 第一个参数指向一个DEVMODE结构,第二个参数为一些标志,这些标志有:


标志
含义
0
当前屏幕的图形模式将被动态地改变
CDS_UPDATEREGISTRY
当前屏幕的图形模式将被动态地改
变并且注册表里的屏幕分辨率的值也_
被更新
(注册表中保存有屏幕的分辨率及相关属性
,以便以后开机或重_
起时加载),
在USER文件中也保存该模式

CDS_TEST 仅供系统测试,
看这种图形模式是否能够正常

CDS_FULLSCREEN 临时改变
Windows NT:
如果切换到另外的桌面,该模式不会被保存

CDS_GLOBAL
该设置将被保存在全局设置区内,对所有用户都起作用

CDS_SET_PRIMARY
设置该设备为私有设备,这里对屏幕对象不起作用

CDS_RESET 恢复以前的设置


声明:
Private Declare Function
lstrcpy Lib "kernel32"
Alias "lstrcpyA" (lpString1 As_
Any, lpString2 As Any) As Long

Private Declare Function ChangeDisplaySettings
Lib "user32" Alias_
"ChangeDisplaySettingsA" (ByVal lpDevMode As Long,
ByVal dwflags As Long) As Long

Private Const CCHDEVICENAME = 32
Private Const CCHFORMNAME = 32

Private Type DEVMODE’详细参考MSDN
dmDeviceName As String * CCHDEVICENAME
dmSpecVersion As Integer
dmDriverVersion As Integer
dmSize As Integer
dmDriverExtra As Integer
dmFields As Long
dmOrientation As Integer
dmPaperSize As Integer
dmPaperLength As Integer
dmPaperWidth As Integer
dmScale As Integer
dmCopies As Integer
dmDefaultSource As Integer
dmPrintQuality As Integer
dmColor As Integer
dmDuplex As Integer
dmYResolution As Integer
dmTTOption As Integer
dmCollate As Integer
dmFormName As String * CCHFORMNAME
dmUnusedPadding As Integer
dmBitsPerPel As Integer
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
End Type

Public Function SetScreen
(Width As Integer,
Height As Integer, Optional Color
As Integer = 16) As Long'这里的
16指的是真16色
Const DM_PELSWIDTH = &H80000
Const DM_PELSHEIGHT = &H100000
Const DM_BITSPERPEL = &H40000
Dim NewDevMode As DEVMODE
Dim pDevmode As Long

With NewDevMode
.dmSize = Len(NewDevMode)'一般为122
If Color = -1 Then
.dmFields = DM_PELSWIDTH Or DM_PELSHEIGHT
Else
.dmFields = DM_PELSWIDTH Or
DM_PELSHEIGHT Or DM_BITSPERPEL
End If
.dmPelsWidth = Width
.dmPelsHeight = Height
If Color < > -1 Then
.dmBitsPerPel = Color
End If
End With

pDevmode = lstrcpy(NewDevMode, NewDevMode)
SetDisplayMode = ChangeDisplaySettings(pDevmode, 0)
End Function


Private Sub Change_Click()
SetScreen Val(Text1), Val(Text2), Val(Text3)
End Sub

’下面三个文本框分别存放分辨率和颜色值
Private Sub Text1_GotFocus()
Text1.SelStart = 0
Text1.SelLength = Len(Text1)
End Sub

Private Sub Text2_GotFocus()
Text2.SelStart = 0
Text2.SelLength = Len(Text1)
End Sub

Private Sub Text3_GotFocus()
Text3.SelStart = 0
Text3.SelLength = Len(Text1)
End Sub


该程序在VB6.0企业版下调试通过。

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